Abstract
The possibility that Graves' ophthalmopathy and autoimmune thyroid disorders may be associated because of autoimmune reactions against antigens shared between human orbital and thyroid tissues was investigated using anti-thyroglobulin (Tg) monoclonal and autoantibodies. Eleven of 16 mouse monoclonal antibodies (MCAB) tested reacted, in an enzyme-linked immunosorbent assay (ELISA), with an antigen in human orbital connective tissue membranes (OCTmem), but not with the OCT soluble fraction, or with membrane or soluble fractions of human eye muscle, lacrimal gland or skin connective tissue. The anti-OCTmem activity was absorbed by OCTmem and Tg, but not by liver membranes or bovine serum albumin (BSA). In preliminary studies four out of 113 human MCAB against thyroid or orbital tissue antigens showed reactivity restricted to Tg and OCTmem. Sera from approximately 50% of patients with autoimmune thyroid disorders, with or without ophthalmopathy, also reacted with OCTmem. The autoantibody activity correlated closely with serum titres of antithyroglobulin but not with the presence, duration, or severity of the eye disease. The OCTmem reactivity was absorbed by Tg, thyroid membranes, and OCTmem but not liver membranes, membranes prepared from other orbital tissues, or BSA. The OCTmem-Tg shared antigen site appeared not to be native thyroglobulin since, (i) MCAB and serum autoantibodies did not react with the cytosol fraction of OCT, and (ii) because the membrane antigen was not solubilizable. Because not all patients with ophthalmopathy have detectable anti-Tg antibodies and, conversely, because not all patients with detectable anti-Tg antibodies develop ophthalmopathy it is unlikely that autoimmunity against a OCTmem-Tg shared antigen is the primary mechanism of Graves' ophthalmopathy, although this possibility has not been excluded. On the other hand the reaction of anti-Tg autoantibodies with OCT membranes may be a model for other autoimmune reactions against other thyroid-orbital tissue-shared antigens. While the pathogenesis of Graves' ophthalmopathy is likely to be multifactorial, humoral and cellular reactions against primary orbital antigens, thyroid-orbitol tissue shared antigens, or both, are likely to play important roles.
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